KR101900472B1 - Stretchable conductive fiber and method of manufacturing the same - Google Patents

Abstract

The present invention discloses conductive fibers and methods for their production. The conductive fiber according to an embodiment of the present invention is composed of a plurality of filaments, elastic fibers having a hierarchical structure; And a metal nano-shell coated on the elastic fiber, wherein the elastic fiber includes a plurality of metal nanoparticles, and the plurality of metal nanoparticles form an electrically interconnected network structure.

Description

STRETCHABLE CONDUCTIVE FIBER AND METHOD OF MANUFACTURING THE SAME Technical Field [1] The present invention relates to a stretchable conductive fiber,

The present invention relates to a conductive fiber and a method for producing the same.

The existing wearable industry shows only limited types of devices such as glasses and watches, so it can be used as a core element in bendable devices that can overcome these limitations and as a key element in increasingly wearable devices. Research on smart technology is required.

Especially, the interest of the public in the field of high-function smartware, which is a new-concept garment which is a fusion of fashion such as IT technology and sportswear, has been attracting attention. However, existing materials still lose their electrical properties easily when they are stretched, and they have a disadvantage in that their mechanical or electrical stability is very weak.

On the other hand, in order to fabricate a fiber-based electronic device such as a strain sensor, first of all, it is necessary to develop a high-performance conductive fiber as an interconnect material.

Conventional conductive fibers, which are commercially available and can be purchased in the market, generally have a metal surface coated with a metal and show excellent electrical performance based on a metal coating. However, cracks in metal coating due to external stimuli such as stretching or bending The stability is poor.

In order to overcome these disadvantages, many researches have been conducted to fabricate conductive fibers using conductive polymers such as PEDOT: PSS (poly (3,4-ethylenedioxythiophene) -poly (styrenesulfonate), polyethylene dioxythiophene-polystyrene sulfonate) , In which case it is difficult to expect higher electrical properties than metals.

Therefore, existing conductive fibers have limitations in securing excellent electrical performance and mechanical stability at the same time. In order to develop the electronic fiber field, it is necessary to develop high performance conductive fibers with high stretchability and stability in order to overcome these shortcomings.

In the case of highly flexible conductive fibers, research has been conducted on applying various carbon-based conductive materials or metal particles to polyurethane or SBS (styrene-butadiene-styrene) based fiber materials However, the polymer has a disadvantage that its electrical performance deteriorates over time because the polymer has poor stability with metals.

Therefore, it is necessary to overcome these disadvantages for the development of highly stretchable conductive polymers having both high electrical performance and mechanical stability, and it is necessary to overcome such disadvantages and develop a conductive fiber having high stability.

Korean Patent Laid-Open Publication No. 10-2016-0053759 (2016.05.13, conductive nanofiber, production method thereof, and conductive nanofiber-based pressure sensor and production method thereof) Korean Registered Patent No. 10-0760652 (Sep. 14, 2007, Manufacturing Method of Silver Nanoparticle-containing Polyurethane Nanofiber Mat) Korean Patent Laid-Open Publication No. 10-2014-0017335 (2014.02.11, Expansion Conductive Composite Yarn, Method for Producing the Same, and Flexible Conductive Composite Yarn)

Embodiments of the present invention are intended to provide a stretchable conductive fiber having improved electrical characteristics and mechanical stability and a method of manufacturing the same.

Embodiments of the present invention also provide flexible conductive fibers that can be used as strain sensors, temperature sensors, heaters, and the like.

The conductive fiber according to an embodiment of the present invention is composed of a plurality of filaments, elastic fibers having a hierarchical structure; And a metal nano shell coated on the elastic fiber, wherein the elastic fiber includes a plurality of metal nanoparticles, and the plurality of metal nanoparticles form an electrically interconnected network structure.

In the conductive fiber according to the embodiment of the present invention, the elastic fiber includes a repeating unit formed by dividing into a first portion and a second portion, and the first portion and the second portion have different strengths from each other And a portion having a high strength among the first portion and the second portion can generate stick-slip motion by deformation.

In the conductive fiber according to an embodiment of the present invention, the plurality of filaments may be arranged parallel to each other, and the portions where the filaments contact with each other may be coupled to each other.

In the conductive fiber according to the embodiment of the present invention, the metal nanoparticles and the metal nanoshell may be formed through absorption of metal ions into the elastic fibers and reduction of the absorbed metal ions.

The absorption and reduction of the metal ion may be performed one to ten times.

In the conductive fiber according to the embodiment of the present invention, the metal may be a noble metal.

In the conductive fiber according to the embodiment of the present invention, the number of the filaments may be 2 to 100.

In the conductive fiber according to the embodiment of the present invention, the average diameter of the filaments may be 5 탆 to 100 탆.

In the conductive fiber according to the embodiment of the present invention, the content of the metal nanoparticles may be 60 wt% to 90 wt%.

In the conductive fiber according to the embodiment of the present invention, the average diameter of the metal nanoparticles may be 0.1 nm to 200 nm.

In the conductive fiber according to the embodiment of the present invention, the average thickness of the metal nanoshell may be 10 nm to 3 탆.

The conductive fiber according to the embodiment of the present invention can be used in any one selected from the group consisting of a strain sensor, a temperature sensor, and a heater.

A method of fabricating a conductive fiber according to an embodiment of the present invention includes: preparing elastic fibers having a hierarchical structure, the elastic fibers having a plurality of filaments; Absorbing metal ions into the elastic fibers; And reducing the absorbed metal ions.

The conductive fibers according to the embodiments of the present invention can be made of a plurality of filaments and can have improved elasticity and mechanical stability by using elastic fibers having a hierarchical structure.

Also, the conductive fibers according to the embodiment of the present invention can improve the electrical characteristics by using a plurality of metal nanoparticles having a network structure included in the elastic fibers and electrically interconnected.

Further, according to the embodiment of the present invention, the conductive fibers having improved electrical characteristics and mechanical stability can be used as strain sensors, temperature sensors, heaters, and the like.

1A is a perspective view of a conductive fiber according to an embodiment of the present invention.
1B is a cross-sectional view of a conductive fiber according to an embodiment of the present invention.
2 is an enlarged view of a part of the filament of the conductive fiber according to the embodiment of the present invention.
3 shows a flow chart of a method of manufacturing a conductive fiber according to an embodiment of the present invention.
4A and 4B are scanning electron microscope (SEM) images of conductive fibers according to an embodiment of the present invention.
5 is an energy spectroscopy (EDS) analysis image of a conductive fiber according to an embodiment of the present invention.
FIG. 6 is a graph showing the electrical conductivity of the conductive fiber according to the embodiment of the present invention versus the number of times of metal ion absorption and reduction. FIG.
FIG. 7 is a graph showing the electrical conductivity of the conductive fiber with respect to the tensile strain according to an embodiment of the present invention. FIG.
8 is a graph showing mechanical properties (stress, stress) of tensile strain of conductive fibers according to an embodiment of the present invention.
FIG. 9 is a graph showing a change in electrical resistance according to a number of stretching times of a conductive fiber according to an embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

As used herein, the terms "embodiment," "example," "side," "example," and the like should be construed as advantageous or advantageous over any other aspect or design It does not.

Also, the term 'or' implies an inclusive or 'inclusive' rather than an exclusive or 'exclusive'. That is, unless expressly stated otherwise or clear from the context, the expression 'x uses a or b' means any of the natural inclusive permutations.

Also, the phrase "a" or "an ", as used in the specification and claims, unless the context clearly dictates otherwise, or to the singular form, .

It will also be understood that when an element such as a film, layer, region, configuration request, etc. is referred to as being "on" or "on" another element, And the like are included.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Figures 1A and 1B illustrate conductive fibers according to embodiments of the present invention.

Specifically, FIG. 1A is a perspective view of a conductive fiber according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view of a conductive fiber according to an embodiment of the present invention.

1A and 1B, a conductive fiber 100 according to an embodiment of the present invention includes an elastic fiber 110, a plurality of metal nanoparticles 120 included in the elastic fiber 110, and elastic fibers 110, And a metal nano-shell 130 coated on the nano-

The elastic fibers 110 may be, for example, elastic fibers, such as rubber, and may be one type of polyurethane fibers. In one example, the elastic fibers 110 contain at least 85% of polyurethane bonds in the fiber-forming material and may have high elasticity.

Here, the polyurethane is a polymer compound having a urethane bond (-NHCOO-) and has both amide bond (-NHCO-) and ester bond (-CO-). That is, the polyurethane has a structure in which an amide group (-CONH-) of nylon is substituted with a urethane group, and has one more oxygen atom than nylon.

The elastic fibers 110 may be manufactured to have various chemical structures and may be manufactured in various ways.

The elastic fibers 110 may be formed by a reaction between a polyol and an excess of diisocyanate to form a prepolymer and a polymerization reaction to increase the degree of polymerization by reacting the prepolymer with a diamine having a low molecular weight . ≪ / RTI >

The elastic fiber 110 may be a copolymer, and may include a repeating unit formed by dividing into a first portion and a second portion. Here, the first portion and the second portion may have different strengths from each other.

In one example, the elastic fibers 110 may be composed of a repeating unit comprising a soft segment as a first portion and a hard segment as a second portion having a higher strength than the first portion. That is, the elastomeric fibers 110 may have a molecular structure of a di-block copolymer comprising repeating units chemically structurally composed of a soft portion and a rigid portion, and such a copolymer may have a linear structure have.

Here, the soft portion imparts elasticity to the copolymer, and the hard portion can impart mechanical strength to the copolymer by intermolecular bonding in the hard portion. Accordingly, the elastic fibers 110 can exhibit elasticity by the elasticity of the soft portion and the mechanical strength of the hard portion.

For example, in the case of a hard part, the urethane and urea groups contained in the hard part may form a hydrogen bond and exist in a crystalline form, respectively.

When the elastic fiber 110 is deformed at a high tensile rate and most of the soft portion is stretched, a high rate of stress is applied to the hard portion, and the hydrogen bond inside the hard portion is broken, A stick slip motion in which a bond is formed again may occur.

Specifically, a hard portion having a higher strength than a soft portion can generate stick-slip motion due to deformation. In the stick-slip motion, a plurality of solid portions are bonded in a layered form due to hydrogen bonding to form a crystalline state Which means that some of the layers are pushed out by external stress and are rejoined in a distorted form.

The elastic fibers 110 are composed of a plurality of filaments 110a and have a hierarchical structure.

Here, the elastic fibers 110 have a hierarchical structure in which a plurality of filaments 110a are arranged in parallel to each other, and portions where the filaments 110a are in contact are connected to each other. Specifically, the elastic fibers 110 may have a configuration in which a plurality of filaments 110a are coupled to each other to form a single fiber.

The plurality of filaments 110a may be, for example, 2 to 100, but is not limited thereto.

The plurality of filaments 110a of the elastic fibers 110 may have an average diameter of, for example, 5 占 퐉 to 100 占 퐉, and preferably 5 占 퐉 to 30 占 퐉, but is not limited thereto.

The plurality of metal nanoparticles 120 are included in the elastic fibers 110. Specifically, the plurality of metal nanoparticles 120 may be included in the inner surface and the surface of the elastic fibers 110. More specifically, the plurality of metal nanoparticles 120 may be included in the respective filaments 110a of the elastic fibers 110, that is, inside and on the surfaces of the respective filaments 110a.

The plurality of metal nanoparticles 120 included in the elastic fibers 110 have a network structure electrically connected to each other.

FIG. 2 is an enlarged view of a part of the filament 110a of the conductive fiber 100 according to the embodiment of the present invention.

Referring to FIG. 2, a plurality of metal nanoparticles 120 are included in the filament 110a and have an electrically interconnected network structure. Here, the network structure means a network structure in which unit particles or elements are arranged in any direction and interconnected.

The plurality of metal nanoparticles 120 may be made of a noble metal such as gold (Au), silver (Ag), platinum (Pt), iridium (Ir) In one example, the plurality of metal particles 120 may be a plurality of silver nanoparticles.

The plurality of metal nanoparticles 120 may be included in the elastic fibers 110 in an amount of 60 to 90% by weight, but the present invention is not limited thereto.

The plurality of metal nanoparticles 120 may have a concentration gradient such that the concentration of the metal nanoparticles 120 decreases from the surface portion of the elastic fibers 110 toward the central portion thereof.

The plurality of metal nanoparticles 120 may have an average diameter of, for example, 0.1 nm to 200 nm, but the present invention is not limited thereto.

The conductive fibers 100 are based on the highly elastic elastic fibers 110 and are configured to include a plurality of metal nanoparticles 120 in a network structure in the elastic fibers 110 to provide high elasticity and high electrical conductivity Lt; / RTI >

Specifically, the conductive fiber 100 has a hierarchical structure of the elastic fibers 110 in which a plurality of filaments 110a are arranged in parallel to each other, and a molecular structure of the elastic fibers 110 in which stick- Even if a strain is applied to the conductive fiber 100, the strain is not applied locally or is applied differently so that the network structure of the metal nanoparticles 120 along the portion where less strain is applied to each filament 110a Can be efficiently maintained.

As a result, the conductive fiber 100 can minimize the loss of the electrical connection between the plurality of metal nanoparticles 120, and can maintain the electrical conductivity even under higher strain. That is, because of the microscale hierarchical structure of the elastic fibers 110 and the molecular structure of the nanoscale, the conductive fibers 100 can have high electrical conductivity even under higher strain.

The metal nano shell 130 is formed to be coated on the elastic fibers 110.

Specifically, the metal nanoshell 130 may be composed of a plurality of metal nanoparticles, and the metal nanoparticles may have a shell shape in which the elastic fibers 110 are coated.

The metal nano-shell 130 may be made of a noble metal such as gold (Au), silver (Ag), platinum (Pt), iridium (Ir) For example, the metal nanoshell 130 may be a silver nanocosil.

The metal nano-shell 130 may have an average thickness of, for example, 10 nm to 3 占 퐉, but is not limited thereto.

The metal nanoshell 130 is formed to coat the elastic fibers 110 and the metal nanoshell 130 is a pure metal component rather than a composite with the polymer so that the initial electrical conductivity of the conductive fiber 100 can be improved have.

When the conductive fibers 100 are deformed, the metal nano-shells 130 hold the filaments 110a so that the filaments 110a are not deformed locally, .

More specifically, depending on the ratio of the metal nanoshell 130 to the diameter or cross-sectional area of each filament 110a, the extent to which the metal nanoshell 130 holds each filament 110a against external deformation is different, The shape of the filaments 110a may be changed.

Particularly, even if an external deformation is applied, the conductive fiber portion occupied by the metal nanoshell 130 can be regarded as not deformed, and since such portions are locally present in each filament 110a, an efficient network can be maintained as a whole.

The metal nanoparticles 120 and the metal nanoshell 130 can be formed through absorption of metal ions into the elastic fibers 110 and reduction of the absorbed metal ions.

Hereinafter, a method of manufacturing a conductive fiber according to an embodiment of the present invention will be described with reference to FIG.

3 shows a flow chart of a method of manufacturing a conductive fiber according to an embodiment of the present invention.

Referring to FIG. 3, a conductive fiber manufacturing method (S100) according to an exemplary embodiment of the present invention includes a step S110 of preparing elastic fibers, a step S120 of absorbing metal ions in the elastic fibers S120, And reducing the ions (S130).

Step S110 is to prepare an elastic fiber composed of a plurality of filaments and having a hierarchical structure.

The elastic fibers can be made to have various chemical structures and can be prepared by various methods such as wet spinning or dry spinning.

Step S120 absorbs a plurality of metal ions into the elastic fibers.

Specifically, the elastic fibers are immersed in a metal ion-containing solution containing metal ions for a predetermined period of time, the elastic fibers are taken out from the metal ion-containing solution, and the residual solvent is evaporated for a predetermined period of time, Ions can be absorbed.

For example, a silver ion-containing solution containing a large amount of silver ions (Ag ⁺ ) dissolved in a large amount (40% by weight) of a precursor of AgCF ₃ COO in ethanol as a solvent is prepared and the elastic fibers are immersed in the solution for 30 minutes. Thereafter, when the elastic fibers are taken out of the solution and residual ethanol is evaporated at room temperature for about 5 minutes, a large amount of silver ions are present on the inside and the surface of the elastic fibers.

Step S130 reduces a plurality of metal ions absorbed by the elastic fibers.

Specifically, a plurality of metal ions absorbed by the elastic fibers may be reduced to a plurality of metal nanoparticles and metal nanoshells using a reducing agent.

For example, a few drops of a reducing agent such as hydrazine hydrate, formaldehyde or sodium borohydride (NaBH ₄ ) are added to the elastic fibers having absorbed silver ions, and after about 5 minutes, When the fibers are washed well with water, the silver ions absorbed by the elastic fibers are reduced to silver nanoparticles, and metal nanoshells are formed on the surfaces of the elastic fibers.

That is, when a plurality of metal ions absorbed in the elastic fibers are reduced to a plurality of metal nanoparticles in step S130, a plurality of metal nanoparticles are contained in the elastic fibers and on the surface of the elastic fibers, The nanoshell is coated.

According to the embodiment, steps S120 and S130 may be repeatedly performed.

Specifically, the step of absorbing metal ions into the elastic fibers (S120) and the step of reducing metal ions absorbed by the elastic fibers (S130) may be performed once or several times or several times, for example, 2 To 10 cycles.

If the elastic fibers are repeatedly caused to absorb a plurality of metal ions (S120) and reduce the absorbed plurality of metal ions (S130), as the number of repetitions of absorption and reduction of the metal ions increases, The number of the metal nanoparticles is included in the elastic fibers, that is, the elastic nanofibers are contained, and the thickness of the metal nanoshell coated on the elastic fibers is also increased.

The absorption of the ions into the elastic fibers and the reduction of the absorbed metal ions are repeatedly performed so that the concentration of the metal nanoparticles and the metal nanoshells decreases from the surface portion toward the central portion of the elastic fibers The concentration of the metal may reach saturation if the absorption and reduction of sufficient metal ions are achieved.

The conductive fiber 100 according to the embodiment of the present invention can be utilized for various applications such as a strain sensor, a temperature sensor, a heater and the like through control of the concentration of the metal nanoparticles and the metal nanoshell. For example, conductive fibers utilized in heaters may include higher concentrations of silver nanoparticles and silver nanoshells than conductive fibers utilized in strain sensors.

For example, a strain sensor is a sensor for detecting a strain due to tensile strain, which is composed of a plurality of filaments and includes elastic fibers having a hierarchical structure and metal nanoshells coated on the elastic fibers, The elastic fibers include a plurality of metal nanoparticles, and the plurality of metal nanoparticles may include conductive fibers forming an electrically interconnected network structure.

More specifically, the strain sensor may include an electrode portion and a sensing portion, and the electrode portion may include the conductive fiber. That is, the conductive fiber according to the embodiment of the present invention can be used in a strain sensor, specifically, in an electrode portion of a strain sensor.

The strain sensor may be a strain sensor that is applicable to wearable articles, and the wearable article may be, for example, a garment, bag, hat or glove. That is, the conductive fiber according to the embodiment of the present invention can be used for a strain sensor applicable to a wearable article.

Hereinafter, examples and comparative examples of the present invention will be described. The following examples are only illustrative of the present invention and the present invention is not limited to the following examples.

Example  One

(Production of Conductive Fiber)

Elastic fibers (Creora (210 d), Hyosung, number of filaments: 14) were prepared.

0.4 g of AgCF3COO as a precursor was dissolved in 0.6 g of ethanol as a solvent at 40% by weight to prepare a silver ion-containing solution containing a large amount of silver ions (Ag ⁺ ).

After immersing the elastic fibers in the prepared silver ion-containing solution, the elastic fibers were taken out of the solution after about 30 minutes, and residual ethanol was evaporated at room temperature (25 ° C) for about 5 minutes to release silver ions Absorbed.

Subsequently, about 3 mL of hydrazine hydrate diluted with ethanol and 50% by volume ratio as a reducing agent was added to the elastic fibers having absorbed silver ions, and about 5 minutes later, the elastic fibers were washed with water to remove the reducing agent It was washed well in turn to reduce the silver ions absorbed by the elastic fibers.

As a result, the silver nanoparticles were absorbed into the elastic fibers, and silver nanoshell-coated conductive fibers were produced.

Then, the absorption and reduction processes of silver ions were repeated eight times.

Evaluation of shape and characteristics of conductive fiber

(Scanning Electron Microscope (SEM) analysis)

The shape of the conductive fibers prepared in Example 1 was observed using a scanning electron microscope (SEM).

4A and 4B are scanning electron microscope (SEM) images of conductive fibers according to an embodiment of the present invention.

Specifically, FIG. 4A is a side-view SEM image of the conductive fiber produced in Example 1, and FIG. 4B is a top-view SEM image.

Referring to FIGS. 4A and 4B, as shown in FIG. 1, the conductive fiber produced in Example 1 is composed of a plurality of filaments, and is based on an elastic fiber having a hierarchical structure, A plurality of metal nanoparticles having a metal nanoshell are included, and it can be confirmed that the metal nanoshell is coated.

(Energy spectroscopy (SEM) analysis)

The conductive fibers prepared in Example 1 were subjected to energy dispersive spectroscopy (EDS) analysis.

5 is an energy spectroscopy (EDS) analysis image of a conductive fiber according to an embodiment of the present invention.

Specifically, FIG. 5 is an EDS image showing the distribution of metal nanoparticles in FIG. 4A, which is a cross-sectional SEM image of the conductive fiber prepared in Example 1. FIG.

Referring to FIG. 5, it can be seen that the metal nanoparticles are uniformly distributed even in the conductive fiber of the conductive fiber produced in Example 1 to form a network.

(Characteristic evaluation)

The electrical conductivity properties of the conductive fibers prepared in Example 1 were evaluated.

FIG. 6 is a graph showing the electrical conductivity of the conductive fiber according to the embodiment of the present invention versus the number of times of metal ion absorption and reduction. FIG.

6, the electrical conductivity was measured every time the metal fibers were absorbed and reduced in the elastic fibers in the production of the conductive fibers in Example 1. The conductive fibers prepared in Example 1 had the number of times of absorption and reduction of the metal ions The conductivity of the conductive fiber increases as the number of the fibers increases.

Specifically, when the number of times of absorbing and reducing metal ions into the elastic fibers was repeated eight times, the conductive fibers exhibited a conductivity of about 20,000 S / cm.

FIG. 7 is a graph showing the electrical conductivity of the conductive fiber with respect to the tensile strain according to an embodiment of the present invention. FIG.

Referring to FIG. 7, it was confirmed that the conductive fibers prepared in Example 1 retained their electrical performance even if their length was increased to about 5.5 times (450% strain) the original length.

Also, as the length of the conductive fiber continuously increased, it was confirmed that the electrical conductivity was continuously decreased, and it was confirmed that the conductive fiber could be applied as a strain sensor.

The mechanical properties of the conductive fibers prepared in Example 1 were evaluated.

8 is a graph showing mechanical properties (stress, stress) of tensile strain of conductive fibers according to an embodiment of the present invention.

Referring to FIG. 8, a 150% pre-strain was applied to the conductive fibers prepared in Example 1, and then tensile strain was repeatedly applied twice at 10%, 30%, 50%, 70% tensile strain was applied, it was confirmed that there was no change in the trajectory, indicating that the mechanical properties were not deteriorated. Thus, it was confirmed that the conductive fiber had not only excellent electrical properties but also high mechanical stability.

FIG. 9 is a graph showing a change in electrical resistance according to a number of stretching times of a conductive fiber according to an embodiment of the present invention. FIG.

Referring to FIG. 9, when the conductive fibers prepared in Example 1 were repeatedly subjected to 10% strain 10,000 times, the electrical resistance was slightly increased at the beginning, but the electrical resistance Was confirmed to be stable.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: conductive fiber 110: elastic fiber
110a: filament 120: metal nanoparticle
130: metal nanoshell

Claims (13)

An elastic fiber composed of a plurality of filaments and having a microscale hierarchical structure; And
A metal nano-shell coated on the elastic fiber and fixing the filament to prevent deformation of the contact portion with the filament,
/ RTI >
Wherein the elastic fibers comprise a plurality of metal nanoparticles and the plurality of metal nanoparticles form a network structure that is electrically interconnected.
The method according to claim 1,
Wherein the elastic fiber comprises a repeating unit formed by dividing into a first portion and a second portion,
Wherein the first portion and the second portion have different strengths and the portion of the first portion and the second portion that has a higher strength generates deformation of the stick slip motion. .
The method according to claim 1,
Wherein the plurality of filaments are arranged in parallel with each other,
And the portions where the filaments contact with each other are connected to each other.
The method according to claim 1,
The metal nanoparticles and the metal nanoshell
Wherein the conductive fibers are formed through absorption of metal ions into the elastic fibers and reduction of the absorbed metal ions.
5. The method of claim 4,
Wherein the metal ions are absorbed and reduced one to ten times.
The method according to claim 1,
Wherein the metal is a noble metal.
The method according to claim 1,
Wherein the filaments have from 2 to 100 fibers.
The method according to claim 1,
Wherein the filaments have an average diameter of 5 mu m to 100 mu m.
The method according to claim 1,
Wherein the content of the metal nanoparticles is 60 wt% to 90 wt%.
The method according to claim 1,
Wherein the average diameter of the metal nanoparticles is 0.1 nm to 200 nm.
The method according to claim 1,
Wherein the metal nanoshell has an average thickness of 10 nm to 3 占 퐉.
The method according to claim 1,
A strain sensor, a temperature sensor, and a heater.
Preparing an elastic fiber composed of a plurality of filaments and having a microscale hierarchical structure; And
A plurality of metal nanoparticles for absorbing metal ions in the elastic fibers and reducing the absorbed metal ions to form a network structure electrically interconnected within the elastic fibers, Coating the nanoshell
Lt; / RTI >
Wherein the metal nanoshell is fixed to the filament so as not to be deformed at a contact portion with the filament.

Images